Malicious PDF — malware analysis report

Static analysis result for SHA-256 529a84fce0dca1bd…

MALICIOUS

PDF

56.2 KB Created: 2021-09-09 13:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c450544b3ceba9eb00b380459abdba45 SHA-1: 9a9a70fb93c6f3c44f3e604edca8102bd6af2705 SHA-256: 529a84fce0dca1bd3695b070f1c55bc2b719cf45464c6235549254dcaffe97bd
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7745

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://paykaaluminiya.ru/ckfinder/userfiles/files/38196142993.pdf
    • http://zhymwz.com/upfile/file/tetosizeladigedeluxup.pdf
    • http://gaishachuukobuhin.com/js/upload/files/keduzovigudefaz.pdf
    • http://polletnv.be/uploads/files/51601898076.pdf
    • http://tetobox-budapest.hu/uploads/files/14963117528.pdf
    • https://sbmhavacilik.com/userfiles/file/rubosewuti.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/20959316038.pdf
    • https://habibitours.com/ckfinder/userfiles/files/85810897902.pdf
    • https://scout-educationguide.com/userfiles/file/48765259002.pdf
    • http://herium.net/FileData/ckfinder/files/20210908_FC657B92EC830F68.pdf
    • http://arebiatours.com/uploads/files/pebefun.pdf
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50102126229.pdf
    • https://bda.ch/ckfinder/userfiles/files/sijosomame.pdf
    • https://hinodanang.com/uploads/image/files/mirebegeteda.pdf
    • https://graveyards-fuj.ae/userfiles/files/nopegodawenojake.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3586c2b6cfa4c78e485eb6b88a9b51bd/zudalufefev.pdf
    • http://donghotam.com/luutru/files/1776406065.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6ca02e0e---90398617292.pdf
    • http://gesundezellen.de/neu/userfiles/file/tekekemafapidojomubu.pdf
    • http://charolais-hessen.de/write/userfiles/file/21824107483.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/69559500165.pdf
    • https://istanajp.com/contents/files/jenug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=as+good+as+it+gets+full+movie+free+online
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 16792 bytes
font_01_sfnt_off0000cd36.bin
63dd3a08a72e3cca3c8f98fa3a5e6ca45704853a80226fab3e6c08c189fdf163		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 10844 bytes

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